Band-saw guide and tension device.



Patented Apr. i5, |902.

A. en uvumuzzl.v BAND SAW GUIDE AND TENSIDN DEVICE.

(Application filed June 5, 1901.)

(No Model.)

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UNTTED STATES PATENT OFFICE.

ARCANGELO GILLARDUZZI, OF PHILADELPHIA, PENNSYLVANIA.

BAND-SAW GUIDE AND TENSION DEVICE.

SPECIFICATION forming part of Letters Patent N o. 697,711, dated .April 15, 1902.

Application filed June 5, 1901. Serial No. 631130. (No model-3 To a/ZZ whom t may concern:

Be it known that I, ARCANGELO GILLAR- DUZZI, a citizen of the United States, residing at Philadelphia,in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Band-Saw Guide and Tension Devices, of which the following is a specification.

My invention relates to improvements in band-saw machines, and has for its obj ect the free guiding aud putting in tension the saw in manner to overcome the objections of mechanisms heretofore in use,which so closely clamped the delicate saws which it is necessary to use, so that they are frequently broken when the piece being sawed causes a bend in the saw as the piece is turned on the saw in followinglines having sharp and shortcurves. The close clamping which prevents the free turning of the saw is completely overcome by my mechanism, where the saw is in no manner clamped, but is guided with only one of its sides, which runs freely, riding on a revolving surface, which receives its motion from the saw,and therefore moves at the same surface speed and without friction between the saw and its guide. The saw is also backed by a revolving surface. With my mechanism the tension on the saw is only partially produced by the separation of the saws driving and carrier pulleys, the full tension being eected by my guides, which permit a long, gradual, and easy twisting of the saw, when necessary, between the face of the upper or carrier and the face of the lower or driving pulley. I also provide adjusting means to vary the tension on the saw and to back saws of various widths, together with means to take up any wear and prevent lost motion being produced by the wear of the rapidly-revolving parts of the mechanism, and also means for their automatic lubrication.

My mechanism is illustrated in the accompanying drawings, in which--Y Figure 1 is a general view in elevation of so much of a band-saw machine as is necessary to show the application of my improvements thereto. Fig. 2 is a rear end view of the upper guide. Fig. 3 is a front end View of the upper guide. Fig. 4 is a plan view of the upper guide. Fig. is a side elevation of the upper guide. Fig. Gis a side elevation of the lower guide. Fig. 7 is a section on line n: Fig. 4. Fig. Sis a central vertical section of the guide-wheels, showing their spindle, take-up mechanism, and automatic lubricating means. Fig. 9 is a front view of the guide-wheels.

Similar figures of reference indicate similar parts throughout the views.

The machine to which my mechanism applies has a framework 1, of which only a portion of the lower and upper parts are shown, (the parts being integrally connected.) A driving-wheel 2 and acarrier 3 are supported on the frame 1, and in most machines the wheel 3 has means for its vertical adjustment v 2 to the face of wheel 8; but with myguide and tension d evice the sa'ws course is deected about three-fourths of an inch outwardfrom the direct line and parallel therewith from guide to guide, as seen in Fig. 1, to insure its tension over the guide-wheels and permit a long and gradual turn of thesaw-blade in following curved lines with quick turns to eliminate the liability of breakages usual where guides are used which prevent the twisting of the saw. at its guiding-points, and thereby cause side strains which result in fractures, owing to the high temper and delicacy of the saws. In the upper part of frame 1 is a bar G, fitted for vertical movement to enable its lower end and the attached upper lguide to be brought near the piece of stuff being operated on bysaw 4. To the lower end of bar 6 is attached lug 7 of arm 8 by a tap-bolt 9. A groove 10 is formed in the upper surface of arm 8, into whichenters tongue 11 of bearer 12 of the guide, which has a central slot 13, through which and through arm 8 a bolt 14 is passed. This construction permits bearer 12 to be adjusted on arm 8 to suit saws of various widths and to properly locate them on the face of pulleys 2 3. Mounted on the outer end of bearer 12 is a box 15, having slotted ends 16, corresponding to simi- IOO lar slots in bearer 12, and through these slots bolts 17 are inserted and hold the box to the arm, but permit its adjusting movement across bearer 12. A groove 18 is formed in the bottomof box and fits over a tongue 19, made ou bearer 12 thus providing for accurate cross movement. Vithin box 15 is secured end 20 of the guide-wheel spindle by vnut 2l, and beyond part 2O the spindle has a conical part v22, the base of which abuts box landat its coned orsmaller end adjoins part 23, which is of uniform diameter, somewhat smaller than the small end of the coned part, has avthread cut on its outer end, and thereon is screwed conicaly sleeve 2l in reverse position from conical part 22 and has a hexagonal-formed outer end, whereby it may be turned on the screw-thread for adjustment,

and is provided with a set-screw 25, whereby it issecured invits proper adjustment. A

L guide-wheel 26 is placed upon the spindle den to .suit the coned part 22 of the spindle and scribed, and the central part of its hub 27 is made of larger diameter than part 23 of the spindle which it surrounds, and the space spindle. ervoir 28 for the introduction of waste or other and its spindle. Each way from the central part of hub 27 outwardly it is bored conical -the tendency to move along the spindle is overcome, andalso to take up any wear. Suradhesive, secured by screws 3l and shutting rounding hub 27 is abodyV 30, of wood or mavterial equally well adapted for retaining an i-nto a pocket formed under flange 32, and upon theouter diameter of body 30 is a covering 33, of leather, rubber, or similar material, which may be cemented or otherwise secured to .body 30. Lower guide-wheel 34 is secured 7to the lower part of frame 1 under table 35 on a spindle 36, the construction ofthe upper and lower guide-wheels and their spindlesand also outer edge 40, against which the back of sawt runs, slightly tapered from body part 30 outward.

I claiml 1. The combination in a band sawing-Inachine, of pulleys; aband-saw supported by the pulleys; guide and ltension wheels each composed of a metallic ange and hub, anon-metallic diskrv and a soft covering applied to the periphery of the disk;'and adjustable supports for the said wheels.

2. The combination in a band sawing-machine, of pulleys; a band-saw; rotary guide and tension wheels, each wheel havinga metallic rim and hub, and a non-metallic disk, said hub being provided with double conical ybearing-surfaces; and a spindle for each wheel having double conical bearings for the hub and'one of said bearings adjustable; the .said hub being provided with an open space for the reception of a lubricant.

3. In a band sawing-machine, rotary guide and tension wheels having a metallic hub, back and narrow rim, a pocket formed by the parts aforesaid, and therein inserted and held, a non-metallic block having properties to retain cement or other adhesive substance.

4L. In a band sawingmachine, metallic l guide and tension wheels having a non-meabsorbent, so that an automatic feeding means f is provided for lubricating theguide-wheelI tallic body secured thereto, and covered with leather or like material upon the parts of the wheels in contact with the saw side, `and ametallic edge raised arou nd one edge of the cover aforesaid against which the saws back `edge may rest when resisting pressure against its cutting edge or teeth. p

5. The combination ina band sawing-machine, of pulleys aband-saw supported by the pulleys; guide and tension wheels located above and below the table; and means for adjusting each wheel in two directions in a horizontal plane; each of the adjusting means comprising an arm with a groove 10, a .bearer 12 with a tongue 11, and a bolt 14, for adjusting the wheel relative to the back edge of the saw; and a box 15 with a groove 18 fitting a tongue on bearer 12 and clamping-bolts, for adj listing the wheel relative to the fiat side of the saw; said boX 15 supportinga spindle with a free end upon which is located the guidingwheel.

In testimony whereof I affix my signature in presence of two witnesses.

ARCANGELO GILLARDUZZI. Witnesses:

W. H. ALoooK, R. C. WRIGHT.

IOO. 

